Analog Devices Inc./Maxim Integrated Tariff Inquiry

MAX639CPA

MAX639CPA Description

The MAX639CPA from Analog Devices Inc./Maxim Integrated is an obsolete but historically significant buck (step-down) switching voltage regulator in an 8-pin DIP (Through Hole) package. Designed for positive output configurations, it delivers adjustable or fixed output voltages ranging from 1.3V (default 5V fixed) to 11.5V, with a maximum input voltage of 11.5V and a minimum input voltage of 4V. Its 225mA output current capability and non-synchronous rectification topology make it suitable for low-to-moderate power applications. Operating within a 0°C to 70°C temperature range, it is REACH unaffected and complies with EAR99/ECCN regulations.

MAX639CPA Features

• Wide Input Range (4V–11.5V): Supports flexible power sources, including unregulated DC supplies.
• Adjustable/Fixed Output (1.3V–11.5V): Default 5V fixed output simplifies design for standard logic circuits.
• Compact Through-Hole Package (8-DIP): Robust for prototyping and legacy systems.
• Low Quiescent Current: Efficient for battery-powered or energy-sensitive applications.
• Non-Synchronous Buck Topology: Cost-effective for basic step-down conversion.
• MSL 1 (Unlimited Shelf Life): No moisture sensitivity concerns during storage.

MAX639CPA Applications

• Legacy Industrial Systems: Replacing obsolete linear regulators in aging equipment.
• Low-Power Embedded Systems: Powering microcontrollers, sensors, and logic circuits in 5V/3.3V designs.
• Battery-Powered Devices: Efficient voltage conversion in portable instruments with 4V–11.5V input (e.g., 9V battery supplies).
• Automotive/Telecom Auxiliary Power: Secondary regulation in non-critical 12V subsystems.

Conclusion of MAX639CPA

While obsolete, the MAX639CPA remains a reliable choice for low-complexity buck conversion in legacy or cost-driven designs. Its wide input range, adjustable output, and through-hole packaging cater to prototyping, repairs, and low-volume production. For modern designs, consider newer alternatives with higher efficiency or synchronous rectification, but the MAX639CPA’s simplicity and analog robustness retain niche relevance.